Publications
USGS research activities relevant to Alaska have yielded more than 9400 historical publications. This page features some of the most recent newsworthy research findings.
Filter Total Items: 3088
Microsatellites: Evolutionary and methodological background and empirical applications at individual, population, and phylogenetic levels Microsatellites: Evolutionary and methodological background and empirical applications at individual, population, and phylogenetic levels
The recent proliferation and greater accessibility of molecular genetic markers has led to a growing appreciation of the ecological and evolutionary inferences that can be drawn from molecular characterizations of individuals and populations (Burke et al. 1992, Avise 1994). Different techniques have the ability to target DNA sequences which have different patterns of inheritance...
Authors
Kim T. Scribner, John M. Pearce
Temporal variation in phenotypic and genotypic traits in two sockeye salmon populations, Tustumena Lake, Alaska Temporal variation in phenotypic and genotypic traits in two sockeye salmon populations, Tustumena Lake, Alaska
Sockeye salmon Oncorhynchus nerka in two tributary streams (about 20 km apart) of the same lake were compared for temporal variation in phenotypic (length, depth adjusted for length) and genotypic (six microsatellite loci) traits. Peak run time (July 16 versus 11 August) and run duration (43 versus 26 d) differed between streams. Populations were sampled twice, including an overlapping...
Authors
Carol Ann Woody, Jeffrey B. Olsen, Joel H. Reynolds, Paul Bentzen
Colonization and development of stream communities across a 200-year gradient in Glacier Bay National Park, Alaska Colonization and development of stream communities across a 200-year gradient in Glacier Bay National Park, Alaska
In May 1997, physical and biological variables were studied in 16 streams of different ages and contrasting stages of development following glacial recession in Glacier Bay National Park, southeast Alaska. The number of microcrustacean and macroinvertebrate taxa and juvenile fish abundance and diversity were significantly greater in older streams. Microcrustacean diversity was related to...
Authors
Alexander M. Milner, E. Eric Knudsen, Chad Soiseth, Anne L. Robertson, Don Schell, Ian T. Phillips, Katrina Magnusson
The bedrock geology of Seattle The bedrock geology of Seattle
No abstract available.
Authors
R. A. Haugerud, Peter J. Haeussler
Testing assumptions for unbiased estimation of survival of radiomarked harlequin ducks Testing assumptions for unbiased estimation of survival of radiomarked harlequin ducks
Unbiased estimates of survival based on individuals outfitted with radiotransmitters require meeting the assumptions that radios do not affect survival, and animals for which the radio signal is lost have the same survival probability as those for which fate is known. In most survival studies, researchers have made these assumptions without testing their validity. We tested these...
Authors
Daniel Esler, Daniel M. Mulcahy, Robert L. Jarvis
Predictability of Bristol Bay, Alaska, sockeye salmon returns one to four years in the future Predictability of Bristol Bay, Alaska, sockeye salmon returns one to four years in the future
Historically, forecast error for returns of sockeye salmon Oncorhynchus nerka to Bristol Bay, Alaska, has been large. Using cross-validation forecast error as our criterion, we selected forecast models for each of the nine principal Bristol Bay drainages. Competing forecast models included stock-recruitment relationships, environmental variables, prior returns of siblings, or...
Authors
Milo D. Adkison, R.M. Peterson
Age- and sex-specific mortality and population structure in sea otters Age- and sex-specific mortality and population structure in sea otters
We used 742 beach-cast carcasses to characterize age- and sex-specific sea otter mortality during the winter of 1990-1991 at Bering Island, Russia. We also examined 363 carcasses recovered after the 1989 grounding of the T/V Exxon Valdez, to characterize age and sex composition in the living western Prince William Sound (WPWS) sea otter population. At Bering Island, mortality was male...
Authors
James L. Bodkin, A.M. Burdin, D.A. Ryazanov
Genetic contribution of three introduced life history forms of sockeye salmon to colonization of Frazer Lake, Alaska Genetic contribution of three introduced life history forms of sockeye salmon to colonization of Frazer Lake, Alaska
No abstract available.
Authors
C. V. Burger, K.T. Scribner, W.J. Spearmen, C.O. Swanton, D.E. Campton
Historic and current use of Lower Cook Inlet, Alaska, by Belugas, Delphinapterus leucas Historic and current use of Lower Cook Inlet, Alaska, by Belugas, Delphinapterus leucas
Dedicated at-sea surveys for marine birds and mammals conducted in lower Cook Inlet in late July and early August from 1995–99 failed to locate any belugas, Delphinapterus leucas. Surveys covered a total of 6,249 linear km and were conducted in both nearshore and offshore habitats. Sightings included 791 individual marine mammals of 10 species. Both historical data and local knowledge...
Authors
Suzann G. Speckman, John F. Piatt
Geologic map of the Wildcat Lake 7.5' quadrangle, Kitsap and Mason Counties, Washington Geologic map of the Wildcat Lake 7.5' quadrangle, Kitsap and Mason Counties, Washington
The Wildcat Lake quadrangle lies in the forearc of the Cascadia subduction zone, about 20-km east of the Cascadia accretionary complex exposed in the Olympic Mountains (Tabor and Cady, 1978),and about 100-km west of the axis of the Cascades volcanic arc. The quadrangle lies near the middle of the Puget Lowland, which typically has elevations less than 600 feet (183 m), but on Gold...
Authors
Peter J. Haeussler, Kenneth P. Clark
Geologic map of the Christian quadrangle, Alaska Geologic map of the Christian quadrangle, Alaska
Most of the Christian quadrangle is in the Porcupine Plateau; the northwestern part is in the southern Brooks Range, and the southern quarter is in the Yukon Flats. Outcrops of bedrock are poor or lacking, except in the Brooks Range. Although large valley glaciers have moved through the Porcupine Plateau, along the East Fork Chandalar and Vanticlese Creek, most of the upland areas in the...
Authors
W. P. Brosge, H. N. Reiser
Alaska resource data file: Chandalar quadrangle Alaska resource data file: Chandalar quadrangle
No abstract available.
Authors
Joe Britton